Overview
The Cromemco Octart was a peripheral I/O board manufactured by the American computer company Cromemco in the early 1980s. Designed for systems built around the S‑100 bus architecture, the Octart provided eight independent 8‑bit parallel ports, enabling a single computer to interface with multiple external devices such as printers, plotters, data‑acquisition instruments, and industrial control equipment.
Technical specifications
- Bus interface: S‑100 (compatible with Cromemco’s Z‑80 and related microcomputer platforms).
- I/O capability: Eight separate 8‑bit parallel ports, each addressable by the host processor.
- Addressing and control: The ports could be individually programmed for input or output operations. The board supported interrupt generation to signal the host CPU when data was available or when a transfer was complete.
- Power requirements: Operated from the standard S‑100 bus power rails (±5 V and +12 V).
Historical context and usage
Cromemco, founded by Harry Garland and Roger Melen, was a prominent supplier of microcomputer hardware in the late 1970s and early 1980s. In addition to its well‑known Dazzler graphics system and Z‑80 based computer kits, the company offered a range of I/O expansion cards to meet the needs of scientific, engineering, and industrial customers. The Octart complemented other Cromemco I/O solutions (e.g., the Quadart, a four‑port parallel board) by scaling the number of parallel channels available to a single system. Contemporary documentation lists the Octart as a common choice for multi‑device control in laboratory automation and for driving multiple line printers in high‑throughput environments.
Legacy
Although the S‑100 bus architecture was eventually superseded by more integrated motherboard designs, the functional concept of providing multiple parallel I/O channels persisted in later computer and embedded system interfaces. The Octart is occasionally referenced in historical retrospectives of Cromemco’s product line as an example of the company’s emphasis on modular, expandable hardware for professional applications.
No further detailed technical documentation on the Octart's internal circuitry or firmware has been widely published in contemporary encyclopedic sources.
